Stepping into the enormous main concourse of this landmarked architectural jewel—with its sweeping granite staircases, hulking columns and 38-meter (125-foot) ceilings painted with night-sky constellations—can be a jaw-dropping experience. What’s even more incredible, though, is the sheer number of people who use it as a commuter hub day in and day out (more than 750,000 train and subway passengers every weekday). Wander around the shops, head down to the basement food court for a bite and to marvel at the crowds hurrying by—and if you get jostled, don't take it personally.

Standing under the starry blue celling, this spot is the perfect place to reunite with friends, corral kids and connect with loved ones. As the literal center of the station, there's never a dull moment waiting here. The Grand Central clock has become a star in its own right—part hollywood celebrity, historic landmark and practical meeting point. The information station at its base is incredibly helpful as well—not only with transportation info but travel tips as well... making it the perfect place to begin and end my trip!

If you happen upon people pressing their faces into a corner and talking to a wall, odds are they aren't crazy– you've found the whispering wall! These low arches amplify the sound of your voice and move it to the opposite corner so you can hear as clearly as if you were standing next to each other. Take a quick detour downstairs (near the oyster bar) and whisper next time you're in Grand Central station.

If you walk behind the Magnolia Bakery in the lower level of Grand Central, you will stumble upon some unique and exceptional paper cutting/stencil artwork by Brooklyn-based Thomas Witte. Not only are the works stunning in their intricacies and detail, they feel like an installation with the backlight giving a feeling that the scene is alive. And, well, it is - you can walk upstairs and see where his inspiration came from.
This should be noted in Afar's NYC travel guide "Artistic Experiences Outside the Museums." It's truly a hidden gem! (Not sure how long the art will be there.)
http://www.afar.com/highlights/the-art-underground--2?context=wanderlist&context_id=22311

Few places in the world have as many people per day pass through it in an attempt to get "there" as Grand Central Terminal. Home to a host of rail and subway lines connecting residents and tourists to their desired destinations, it's a flurry of activity at any hour.

The four sided opal clock atop the information booth in the Main Concourse of Grand Central Station in Manhattan is one of the most famous meeting places in the city. Grab a time table and your partner in crime and you're off!

A mid-town New York historic treasure, Grand Central Terminal is home to commuter trains, Amtrak lines and connections to the New York Subway. This picture taken from the east balcony offers a quiet perch above the busy hub that close to 1 million people pass through on any given day.